#!/usr/bin/env python3

import sys
import math

def better_algo_X(A, k):
    l = -1 * math.inf
    r = math.inf
    for i in range(0, len(A)):
        c = 0
        for j in range(i, len(A)):
            print("i =", i, "j =", j, "c =", c)
            if A[i] == A[j]:
                c = c + 1
                if c >= k:
                    if r - l > j - i:
                        l = i
                        r = j
                        print("l =", l, "r = ", r)
                    break
    return [l, r]

A = []
for line in sys.stdin:
    line = line.strip()
    if line == '' or line == '\n':
        break
    A.append(int(line))

print(better_algo_X(A[1:], A[0]))